Net force, electric field and potential

[tag16]

Homework Statement

Given two particles with 2.00 microcoulombs charges and a particle with charge q= 1.28x10^-18C at the origin.(a) what is the net force exerted by the two 2.00 microcoulombs charges on the test charge q? (b) What is the electric field at the origin due to the two 2.00 microcoulomb particles? (c) What is the electric potential at the origin due to the two 2.00 microcoulombs particles?

Homework Equations

Vp=k(q1/r1+q2/r2)

The Attempt at a Solution

I have no idea how to do part a and b, but I think just use the above equation for part c correct?

 

[tiny-tim]

Hi tag16!

Given two particles with 2.00 microcoulombs charges …

(erm … where? … anyway:)

Forces and fields are both vectors, and so they add like vectors, so just find the force (or field) from each particle, and add.